Just join and get involved. You might be surprised who you see there from school.
Our intakes although predominately Yr8 range up to Yr11. The older ones though are understandably concentrating on GCSE.
A CO of a local sqn tried to operate a maximum joining group and created a waiting list, as it’s what they did at his old sqn, but it backfired and when they were contacted many were no longer interest and now takes all comers.
The only waiting list we have are those under age who express an interest, who we contact 2 months before they become eligible.